Shift control method for an automatic gearbox

Details Shift control method for an automatic gearbox Shift control method for an automatic gearbox

2005-12-02

2009-12-15

Lewis, Tisha D (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

With clutch control

C477S115000, C477S170000

Reexamination Certificate

active

07632211

ABSTRACT:
A shift control method of a range group transmission with a multi-speed main transmission, which connects with a drive motor, via a clutch (K) and an input shaft. A transmission brake optionally engages the input shaft. At least a two range group is located downstream of the main transmission. A range change shift is accomplished by changing a gear of the main transmission and the range group. The shifting sequence is accelerated by: reducing motor torque and disengaging the clutch (K); disengaging a previous range group gear; synchronizing a new range group gear; disengaging a previous main transmission gear; engaging the new range group gear; synchronizing a new main transmission gear; engaging the new main transmission gear; and engaging the clutch (K) and increasing the motor torque, such that synchronization of the new gear occurs by influencing the input shaft of the main transmission.

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